Brinno KNS100 Knocking Sensor for PHV1330 Hidden Front Door Camera Product Details Part Number: G1330 Item Weight: 0.8 ounces Product Dimensions: 5.8 x 4 x 0.8 inches Item model number: KNS100 Item Package Quantity: 1 Batteries Included?: No Warranty Description: 1 Year Limited Shipping Weight: 1.6 ounces Date First Available: November 16, 2011 For use with the Brinno PHV133012 Digital PeepHole Viewer Fits into a slot on the back of the Digital PeepHole Viewer Takes pictures of anyone knocking at your door by sensing the vibration produced by knocking Provides added security by allowing the Digital PeepHole Viewer to record photos of who's at your door even when you're not home No batteries needed For use with the Brinno PHV1330 Hidden Front Door Camera. This sensor fitsinto a slot on the back of the Hidden Front Door Camera and triggers it totake a picture of anyone knocking at your door by sensing the vibrationproduced by knocking. Provides added security by allowing the Digital PeepHoleViewer to record photos of who's at your door even when you're not home. Nobatteries needed. Not for use with the optional Motion Sensor. Not compatiblewith the original Brinno PHV132512 Digital PeepHole Viewer. From the Manufacturer For use with the Brinno PHV133012 Digital PeepHole Viewer. This sensor fitsinto a slot on the back of the Digital PeepHole Viewer and triggers it to takea picture of anyone knocking at your door by sensing the vibration produced byknocking. Provides added security by allowing the Digital PeepHole Viewer torecord photos of who's at your door even when you're not home. No batteriesneeded. Not for use with the optional Motion Sensor. Not compatible with theoriginal Brinno PHV132512 Electronic PeepHole Viewer.